Characterisation of Fly Ash & Slag and Application of Alkali Activated Fly Ash in Pavement

Abstract

Every year, large amount of coal is using in different type of industries which is producing huge amount of by-products. Dumping of these by-products became a major issue. It required large piece of land, proper construction of dumping pit, high maintenance etc. similarly, in road construction, huge amount of aggregate is required. Instead of using natural aggregate, using of by-products can solve two major problems. One is, save land from dumping or digging, which can use in some other purpose and other one, save environment. But, before using of these by-products, proper analysis is required to expand the ways to reuse it firmly. For that purpose, information about not only of chemical composition of elements, but also chemical structure of fa and slag is required. Various properties like chemical composition, phase composition, shape and size, unburned carbon content, free lime content, pH value and toxic or hazardous elements present in fa and slag can be determined by using experimental methods like x-ray diffraction (XRD), titration method, Scanning Electron Microscope test (SEM), Electron Dispersive X-ray Spectroscopy (EDX) and Loss On Ignition test. Geopolymerization was done using sodium hydroxide with different percentage of NaOH.